Process of producing isolating plates for deadening noises and vibrations



y 11, 1933- E. SCHLUTER 1,918,140

PROCESS OF PRODUCING ISOLATING PLATES FOR DEADENING NOISES ANDVIBRATIONS Filed July 6, 1929 Patented July 11, 1933 UNITED STATESPATENT- oFFIcs ERNST SGHLUIER, OF BERLINJOHAI NISTHAL, GERMANY,ASfSIGNOR, IBY MESNE ASSIGNMENTS, TO KELDUR CORPORATION, OF NEWARK, NEWJERSEY, A CORPORA- TION OF NEV] JERSEY rnoouss or PRODUCING reel-ArmsPLATES son nnannnrue ,NOISES AND VIBRAT'IONS This invention relates toisolating mateuals orplates for absorbing or deadening noises andvibrations, especially of machines,

and processes and apparatus for producing sthe same. lsolating materialor" thistype must be uniformly effective for a considerable time as thefoundations oi heavy machines, engines and the like, and cannot well bealtered and must remain in place for "years. These foundations arefrequently exposed to changing temoeratures, influences of the weather,moisture and the like, and these. influences must have a minimum effectupon the resiliency of the isolating material. The nia-in or basematerial of such isolation plates. requires the addition of specialprotective substances and the latter have to be admixed in variousmanners in order to ,iullill various requirements. As the base or mainmaterial I use jellyforming'substances (like glue or gelatine) withglycerine or ethylene glycol or similar high-boiling, poly-basicalcohols in approximately equal parts. Used printing rolls con- 'sistingchiefly or" glue and gelatin are an excellent base material. Besidesglue and gelatin, the base material may contain such sub stances asglucose, sugar, caramel, stearin .oil, turkey red oil, animal fat,etc.,- which so are also used in making printing rolls.

Certain additions to the base material are required for protectionagainst influences of the weather, temperature and moisture, forpreserving the flexibility, and for preventing decomposition or decay.Such additions are of two classes: The first class includes substanceswhich render the gelatin-like C0111? ponent of the base materialinsoluble in water and resistant to softening when the temperature israised. These substances are in general the same as are used for tanningleather and include specifically chromium salts, aluminum salts, tannin,formaldehyde and other aldehydes. The second class ineludes substanceswhich prevent decompositiondue to bacterial action. In general, thisclass of materials includes all of the well known preservatives againstbacteria, but salicylic acid, lysoform, lysol and formalde 5D hyde areespecially suitable. Some ofthe plates'are hung up for impregnating.

.,., I Application filed July 6, 1929, Serial No. 376,486, and' inFrance February 19, 1929.

tanning agents have also a preservative effect. Thus, among the addedsubstances which may be incorporated in the base ma terial are mineralsalts or acids or organic salts, acids, alcohols, aldehydes orother'organic substances, specially chromic salts,- alunnnum salts,boric salts, lime, magnesia, oxalic acid, calcium sulphate, ethylormethyl-alcoh'ol, niagnesium carbonate, aluminia, zinc oxide, salicylicacid, tannin, lysofornr, hexamethylentetrainine, t r i O'X y m ethylene,formaldehyde,- or formaldehyde with methyl amine, aniline andformaldehyde, orthotoluidine with formali'lehyde, furfu'rol, furfuramine, furfuraldehyde, acetaldehyde, acroleme, pcntosen, pentosan,arabinose, xyl'ose', cellulose or lignine or ground cork, celluloseester, cellulose acetate, triphenylphosphate,' tricresylphospha-te, oilshardened with sulphur etc.

The additional substances may be united With the main substances insuitable mixing proportions, generally with a certain quantity of Water.The main-substances as well as the additional substances are suitablychosen for the particular purposes in hand and they may be mixeddirectly or successively.

Substances not soluble'in water" or other liquid solvent, or notliquefied by heat, may be added finely ground with liquids likeglycerine or in an emulsion state i In the accompanyingdrawing, Fig. Iis a diagrannnatical elevation of a plant for the production ofisolation plates,

Fig. 2 is an elevation of the apparatus in which the plates are cast,partly in section, I and Fig. 8 shows in a perspective View how the Glueor gelatine and glycerine in equal quantities with a little salicylicacid are heated to liquefaction in a preliminary melting vessel a,thoroughly mixed and forced w through a pipe 6 intoa vesselc in whichthe liquid mass has to pass through a screen (if in order to beliberated from solid admixtures. Compressed air, produced. in acompressere, flows through a pipe f and serves to force the liquid massfrom the vesselc into the mould ..water jackets or chambers 70.

to ascertain the complete filling of the mould and assists in increasingthe pressure, and acts as an overflow from the mould cavity. After themould has been filled, as indicated by the presence of overflowingmaterial in the hopper t, the moulded mass p is allowed to cool, andsolidify to a considerable extent, preferably with the mould rotatedupon its axis to an approximately horizontal position, this coolingaction being hastened by the The moulded sheet or plate is then insuitable condition to permit desired handling after removal of the.

removable mould section.

The inner walls of the mould chamber 1 .,(Fig. 2) are covered on bothsides with a ute fabric n which covers at either end a bar 0, said barsserving to limit the mould cavity or slot Z. In this manner a loop g isformed above the cast plate p when the bar ,0 is being removed, saidloop serving to receive a rod 1; for carrying the plate for dry ing andother subsequent treatment (Fig. 3). The drying is preferably carriedout at ordinary temperature and it is finished in a few .weeks accordingto the thickness of the plate.

The additional substances designed to protect against heat, decay,weather and so forth are introduced into the mass by impregnation of thefinished plate.

are suspended by means of rods 1) in a ame s so that they are uniformlywashed from all sides by the impregnation liquid in the vessel 9.

The impregnation liquid may be, for ex- 45. ample, produced as follows:

In 5 to 6 liters of water 3 kgs. of pure and crystallized potassiumbichromate K Cr; 0 and 250 grs. of alum K SO AIASO.) QH O are dissolvedat about C. and

300 grs. of hexamethylenetetramine N (CH 6 are added. The mixture iswell stirred and boiled, cooled by water and boiled again, the boilingand cooling being repeated for instance three times, whereupon the massis allowed to cool slowly. After cooling are added:

2 kgs. formaldehyde solution HCOH 40% kg. glycerine C H (OH) 3 150 grs.lysoform (technical solution of formaldehyde in alcoholic potassium soapsolution), and further a coloring liquid, as for instance purple copyingink about 15 to 20 grs. The whole is stirred until a dark colouring hasbeen obtained, whereupon 85 liters of. water are added.

lVith this object in 40 view a certain number of plates r The platesremain in this impregnating liquid for 15 to 20 minutes under a pressureof about 2 atms. and are then removed and dried.

The term gelatin-like substance is used in the appended claims todesignate a gelatinous substance of the protein class, of which gelatinand glue are typical examples, which is capable of forming with aglyceric substance a tenacious, resilient product (such as is used tomake printing rolls). The term glyceric substance is used in theappended claims to designate a substance of the polybasic, high-boilingalcohol type, of which glycerin and ethylene glycol are typicalexamples, which is capable of forming with a gelatin-like substance atenacious, resilient product (such as is used to make printing rolls).

I claim:

1. The method'of producing a vibrationabsorbing product which comprisesmolding a plastic coherent mass compounded mainly of a gelatin-likesubstance and a glyceric substance, and impregnating the molded productafter appropriate curing by immersion in a liquor containing at'leastone agent for increasing the resistance of the product in itscontemplated use as a vibration-absorbing medium to the deterioratinginfluences of temperature, moisture and decomposition.

2. The method of producing a vibration absorbing product which comprisesmolding a plastic coherent mass compounded mainly of a gelatin-likesubstance and a glyceric substance and containing an antiseptic agent,and impregnating the molded product after appropriate curing byimmersion in a liquor containing at least one agent for enhancing theultimate properties of the product in its contemplated use as avibration-absorbing medium.

3. The method of producing a vibrationabsorbing product which comprisesforming with the aid of heat a plastic coherent mass compounded mainlyof a gelatin-like substance and a glyceric substance and containing asmall amount of salicylic acid, molding said plastic mass, curing theresulting molded product, and impregnating the cured product with atleast one agent for increasing the resistance of the product in itscontemplated use as a vibration-absorbing medium to the deterioratinginfluences of temperature and moisture. 1

4. The method of producing a vibrationabsorbing product which comprisesmolding a plastic coherent mass compounded mainly of a gelatinslikesubstance and a glyceric substance, and impregnating the molded productby immersion in a liquor containing a chromic salt and formaldehyde forimparting to the product an increased resistance to deterioration in itscontemplated use as a vibration-absorbing medium.

5. The method of producing a vibrationabsorbing product which comprisesmolding a plastic coherent mass compounded mainly of a gelatin-likesubstance and a glyceric substance, and impregnating the molded productby immersion in a liquor containing an alkali bichromate, alum,formaldehyde, and lysoform.

6. The method of producing a vibrationabsorbing product which comprisesmolding a plastic coherent mass compounded mainly of a gelatin-likesubstance and a glyceric substance, and impregnating the molded productby immersion in a liquor containing an alkali bichromate, formaldehydeand glycerine.

7. The method of producing a vibrationabsorbing product which comprisesmolding a plastic coherent mass compounded mainly of a gelatin-likesubstance and a glyceric substance, and impregnating the molded productby immersion in a llquor containlng achromic salt, formaldehyde andglycerine.

8. The method of producing a vibrationabsorbing product, which comprisesmolding a plastic coherent mass compounded mainly of a gelatin-likesubstance and a glyceric substance, and impregnating the molded productby immersion in a liquid containing chromium salts, formaldehyde, alum,lysoform, glycerin, and salicylic acid.

9. The method of producing a vibrationabsorbing product, whichcomprisesmolding a plastic coherent mass compounded mainly of agelatin-like substance and a glyceric substance, and containingsalicylic acid, and impregnating the molded product after appropriatecuring by innnersion in a liquor containing at least one agent forincreasing the resistance of the product in its contemplated use as avibration-absorbing medium to the deterioratinginfluence of temperature,moisture and decomposition.

10. The method of producing a vibrationabsorbing product, Whichcomprises molding a plastic coherent mass compounded mainly of agelatin-like substance and a glyceric substance, and impregnating themolded product by immersion in a liquid containing chromium saltsas ahardening agent.

11. The method of producing ia vibration-absorbing product, whichcomprises molding a plastic coherent mass compounded mainly of agelatin-like substance and a glyceric substance, and impregnating themolded product by immersion in a liquid containing alum as a hardeningagent.

1 The method of producing a Vibration-- absorbing product whichcomprises molding a plastic coherent mass compounded mainly of agelatindike substance and a glyceric substance onto a portion of afabric sheet, While leaving another portion of the sheet free from themolded mass, and suspending the molded product during subsequent curingby means of the portion of the fabric Which is free from the moldedmass.

13. The method of producing a vibrationabsorbing product, whichcomprises molding aplastic coherent mass compounded mainly of agelatin-like substance and a glycerio substance onto and betweenportions of the plies of a folded sheet, While leaving a portion of eachply adjacent the fold free from the molded mass, and suspending themolded product during subsequent curing from a supporting rod extendingbetween the plies of the sheet and between the molded mass and the foldofthe sheet.

In Witness whereof I ai'fix my signature.

ERNST SCHLUTER.

